Cirrus Logic CS43L22 - Manual (Page 54)

54 DS792F2
CS43L22
Confidential Draft
3/4/10
7.23.4 Limiter Zero Cross Disable
Configures an override of the digital zero cross setting.
7.24 Limiter Control 2, Release Rate (Address 28h)
7.24.1 Peak Detect and Limiter
Configures the peak detect and limiter circuitry.
7.24.2 Peak Signal Limit All Channels
Sets how channels are attenuated when the limiter is enabled.
7.24.3 Limiter Release Rate
Sets the rate at which the limiter releases the digital attenuation from levels below the CUSH[2:0] thresh-
old (
“Limiter Cushion Threshold” on page 53 ) and returns the analog output level to the MSTxVOL[7:0]
( “Master Volume Control” on page 51 ) setting.
Note: The limiter release rate is user-selectable but is also a function of the sampling frequency, Fs,
and the DIGSFT ( “Digital Soft Ramp” on page 44 ) and DIGZC ( “Digital Zero Cross” on page 45 ) setting.
LIMZCDIS Limiter Zero Cross Disable
0 OFF; Limiter Attack Rate is dictated by the DIGZC ( “Digital Zero Cross” on page 45 ) setting
1 ON; Limiter volume changes take effect in one step, regardless of the DIGZC setting.
Application: “Limiter” on page 22
7 6 5 4 3 2 1 0
LIMIT LIMIT_ALL LIMRRATE5 LIMRRATE4 LIMRRATE3 LIMRRATE2 LIMRRATE1 LIMRRATE0
LIMIT Limiter Status
0 Disabled
1 Enabled
Application: “Limiter” on page 22
LIMIT_ALL Limiter action:
0
Apply the necessary attenuation on a specific channel only when the signal amplitude on that specific chan-
nel rises above LMAX.
Remove attenuation on a specific channel only when the signal amplitude on that specific channel falls below
CUSH.
1
Apply the necessary attenuation on BOTH channels when the signal amplitude on any ONE channel rises
above LMAX.
Remove attenuation on BOTH channels only when the signal amplitude on BOTH channels fall below CUSH.
Application: “Limiter” on page 22
LIMRRATE[5:0] Release Time
00 0000 Fastest Release
··· ···
11 1111 Slowest Release
Application: “Limiter” on page 22